Plumb bob



W. W. WINDHAM PLUMB 308 Filed Nov. 5. 1923 Patented July 29, 1924.

UNITED STATES WILLIAM W. WINDHAM, O-F OLYMPIA, WASHINGTON.

PLUMB BOB.

Application filed November 3, 1923. Serial No. 672,578.

eral character having novel and improved means whereby its length of cord may be regulated as desired and in a manner whereby the bob is held at the point desired on the cord and in a manner to eliminate the liability of the bob being accidentally displaced.

Furthermore it is an object of the invention to provide a novel and improved device of this general character formed of a single piece of material and constructed in a manner whereby its efiiciency will not be impaired by sand, mud or the like.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved plumb bob whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the better understood, I will now proceed to describe the same with reference to the accompanying drawings, wherein Figure 1 is a view in elevation illustrating a plumb bob constructed in accordance with an embodiment of my invention.

Figure 2 is a view in top plan of the device illustrated in Figure 1 with the cord omitted;

Figure 3 is a vertical sectional view taken through the device as illustrated in Figure 1;

a Figure 4 is a sectional view taken substantially on the line. 4.--4= of Figure 3.

As disclosed in the accompanying drawing's, mv improved bob comprises a body 1 of suitable material and conical in form and extending outwardly from the central portion of the larger end of the body 1 and integral therewith is a post 2. The post 2 at a predetermined point spaced fro-m the larger end of the body 1 is provided with an outstanding annular flange 3 whereby is provided between said flange 3 and the adjacent end of the body 1 a drum 4 upon which the cord is adapted to be wound, An extremity of the cord is secured to the drum 4 in any desired manner preferably by threading the cord through an opening 5 disposed radially through the drum 4 with the adjacent end of the cord knotted or otherwise enlarged, as at 6.

The post 2 outwardly of but immediately adjacent to the flange 3 is reduced in diameter so that the outer end of the post terminatesin a head 7 provided at its axial center and coplanar with the point of the body 1 with a longitudinally disposed eye 8 with which communicates a laterally disposed and downwardly and circumferentially disposed entrance slot 9, said slot 9 providing means whereby the suspension cord C may be properly engaged within the eye 8 without the necessity of threading the outer or free end of said cord C through the eye.

The periphery of the flange 3 has disposed entirely therearound a groove or channel 10 and the outer face of said flange 3 or face opposed to the head 7 is provided with the inwardly disposed grooves 11 substantially tangential to the reduced portions of the post 3, the inner ends of said grooves terminating immediately adjacent to such reduced portion and having their outer ends open. The depth of each of the grooves 11 gradually decreases from its outer end toward its inner end and the outer open end of said groove is in communication with a peripheral groove 10.

My improved bob is formed of one solid piece of material whereby there are no separable parts or any mechanism which would be rendered inoperative by mud, sand or the like. My improved bob is of a character to render it perfectly accurate for every requirement.

The grooves 11 are spaced apart circumferentially of the flange 3 with adjacent grooves in relatively close proximity one to the other. This is of particular advantage as it permits a comparatively slight adjustment of the cord with the assurance of the bob being effectively held against slippage.

In practice, after the required amount of cord has been unwound from the drum 4, it

is only necessary to engage the cord within a roove 11 and within the eye 8 resulting in.

a rm securement of the bob with respect to the cord and in a manner to eliminate the liability of accidental movement of the bob with relation to the cord. Furthermore it is to be noted that by the provision of the grooves 11 an adjustment may be had materially less than the extent of a coil of the cord G upon the drum 4.

From the foregoing description it is thought to be obvious that a plumb bob constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some change and modification without departin from the principles and spirit thereof an for this reason I do not wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice except as hereinafter claimed.

1 claim 1. As a new article of manufacture, a plumb bob comprising a body provided with an outstanding post, an outstanding flange aoaeoe carried by the post in spaced relation-with respect to the body, the outer end portion of the post being rovided with an eye, there being an open s ot in the peripheral surface of the post in communication with said eye, a line being insertible into the eye through the slot, the outer face of the flange being provided with a series of circumferentially spaced grooves, the grooves of the flange extending to a point substantially tangential to the adjacent portion of the post.

2. As a new article of manufacture, a

plumb bob comprising a body provided with an outstanding post, an outstanding flange carried by the post in spaced relation with respect to the body, the outer end portion of the post being provided with an eye, there being a lateral open slot in the peripheral surface of the post in communication with said eye, a line being insertible into the eye through the slot, the outer face of the flange being provided with a series of circumferentially spaced grooves, each groove having its outer end open and extending to a point substantially tangent to the surface of said 0st. p In testimony whereof I hereunto afix my signature.

WILLIAM W. WINDHAM. 

